Research Of Virtual Lamp System In Indoor Visible Light Communication

The indoor visible light communication technology integrating communication and illumination has gradually become the direction of people's research.The reasons are its advantages of green environmental protection,abundant available bandwidth resources,and easy to fast networking.The propagation channel of the simulated indoor visible light communication system can bring great benefits to the well-designed system.In previous research work,optical signals propagated in a single diffuse mode in most models without considering specular reflection.Therefore,this paper's research work focuses on the performance of channel characteristics in mixed reflection mode.Based on the original channel model,the concept of virtual light is proposed.A new standard indoor visible light communication model based on virtual light is established.A symmetric algorithm based on Monte Carlo algorithm is proposed and the channel model is deeply analyzed and studied.Firstly,this paper starts from the background of visible light development,outlining its development history and people's research progress on indoor visible channel modeling.Then introduces the new standard indoor visible light four-lamp communication model based on virtual light.Moreover,this paper puts forward the concept of virtual light and the method of calculating optical power at the receiving terminal.Secondly,combined with the Monte Carlo algorithm-based symmetric algorithm,the primary reflection impulse and the secondary reflection impulse response of the channel are calculated.This method makes up for the drawbacks of complicated calculation and incomplete consideration in the traditional channel modeling and simulation process.To the extent that indoor visible light modeling is further optimized.Finally,the optical signal is modulated and demodulated by OOK in this virtual light system.And the channel impulse response is compensated by zero-forcing equalization.The simulation curves show that when the signal-to-noise ratio is same,the error rate of the indoor virtual light system is lower than that of the traditional VLC system.It confirms that the virtual light system's communication performance is better.When the signal-to-noise ratio is 20 dB and the transmission sequence is forced to zero equalization,the value is clearly demarcated at 1/2,which reduces the multipath interference caused by the reflection of light on the mirror and the wall effectively.